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Rubbing Out Roughness

Photonics Spectra
Oct 2000
Daniel S. Burgess, News Editor

Does anyone have information about testing methods for optical mirror surfaces with microroughness of 1 nm rms or less?

Yuri Petrunin, President
Telescope Engineering Co.
Lakewood, Colo.
March 1997

The team at Telescope Engineering Co. had a problem. In 1997, potential institutional customers asked the company to document how it approaches issues of scattered light and surface micro-roughness. The company, which produces mirrors, optical elements and telescopes -- mainly for experienced amateur astronomers -- prides itself on the quality of its products. Its test metrology lab was equipped with Fizeau and Twyman-Green interferometers and a goniometer but did not have a method in place to measure the roughness of its optical surfaces. The company, now in Golden, Colo., turned to the readers of Photonics Spectra

The science of measurement, particularly of lengths and angles.
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